Pinpoint Test G: DTCs B29A1, B29AB, B29A3 and B29AD
Fire Suppression System
Pinpoint Tests
Pinpoint Test G: DTCs B29A1, B29AB, B29A3 and B29AD
Refer to Wiring Diagram Set 96, Police Option for schematic and connector information. Diagrams By Number
Normal Operation
The Fire Suppression System Module (FSSM) checks all of the fire suppressor circuits for faults. If the FSSM detects a short to ground on the LH fire suppressor squib 2 circuits, it stores DTC B29A1 in continuous memory and illuminates the fire suppression system indicator. If the FSSM detects a low resistance condition between the LH fire suppressor squib 2 circuits, it stores DTC B29A3 in continuous memory and illuminates the fire suppression system indicator. If the FSSM detects a short to ground on the RH fire suppressor squib 2 circuits, it stores DTC B29AB in continuous memory and illuminates the fire suppression system indicator. If the FSSM detects a low resistance condition between the RH fire suppressor squib 2 circuits, it stores DTC B29AD in continuous memory and illuminates the fire suppression system indicator.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- RH fire suppressor
- LH fire suppressor
- FSSM
PINPOINT TEST G: DTCs B29A1, B29AB, B29A3 AND B29AD
WARNING: To reduce the risk of accidental deployment, never probe the connectors on the fire suppressors. Failure to follow this instruction may cause unintentional deployment of the suppressors, which may result in serious personal injury.
WARNING: To prevent the risk of inadvertent deployment of the fire suppression system (FSS), never defeat wiring connector shorting bars or remove the connectors. All fire suppressor wiring connectors incorporate shorting bars to reduce the potential of static electricity charges causing unintended suppressor activation. Failure to follow this warning may result in serious personal injury or death.
NOTE: Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test. Inspection and Verification
NOTE: The fire suppression system must be fully operational and free of faults before releasing the vehicle to the customer.
NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery.
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G1 CHECK FOR ON-DEMAND DTCs OR CONTINUOUS MEMORY DTCs
- Carry out the FSSM self-test.
- Is DTC B29A1, B29AB, B29A3, or B29AD retrieved as an on-demand DTC during the self-test?
Yes
GO to G2.
No
CHECK for causes of the intermittent fault. ATTEMPT to recreate the hard fault by flexing the wire harness and cycling the key in the ignition lock cylinder frequently. REPEAT the self-test.
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G2 CHECK THE FSSM
- Ignition OFF.
- WARNING: To reduce the risk of accidental deployment, do not use any memory saver devices when depowering the fire suppression system. Failure to follow this instruction may result in serious personal injury.
- Disconnect: Negative Battery Cable.
- Wait approximately 60 seconds to allow the fire suppression system backup power supply to deplete.
- Disconnect: FSSM C3281b.
- Connect: Negative Battery Cable.
- NOTE: DTCs B299F and B29A9 are expected to be retrieved when the self-test is carried out with the FSSM C3281b disconnected. These DTCs can be cleared once all the fire suppression connections are restored. If DTC B299F or DTC B29A9 is retrieved with all the fire suppression connections restored, refer to DTC Charts. Diagnostic Trouble Code Tests and Associated Procedures
- Carry out the FSSM self-test.
- Is DTC B29A1, B29AB, B29A3, or B29AD retrieved as an on-demand DTC during the self-test?
Yes
GO to G5.
No
GO to G3.
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G3 CHECK THE FIRE SUPPRESSORS
- Ignition OFF.
- WARNING: To reduce the risk of accidental deployment, do not use any memory saver devices when depowering the fire suppression system. Failure to follow this instruction may result in serious personal injury.
- Disconnect: Negative Battery Cable.
- Wait approximately 60 seconds to allow the fire suppression system backup power supply to deplete.
- Connect: FSSM C3281b.
- Disconnect: Suspect Fire Suppressor.
- Connect: Negative Battery Cable.
- Clear the FSSM DTCs.
- NOTE: DTCs B299A and B299F are expected to be retrieved when the self-test is carried out with the LH fire suppressor C4317 disconnected. DTCs B29A4 and B29A9 are expected to be retrieved when the self-test is carried out with the RH fire suppressor C4316 disconnected. These DTCs can be cleared once all the fire suppression connections are restored. If DTC B299A, B299F, B29A4, or B29A9 is retrieved with all the fire suppression connections restored, refer to DTC Charts. Diagnostic Trouble Code Tests and Associated Procedures
- Carry out the FSSM self-test.
- Is DTC B29A1, B29AB, B29A3, or B29AD retrieved as an on-demand DTC during the self-test?
Yes
INSTALL a new fire suppression system harness. GO to G4.
No
If DTC B29AB or DTC B29AD was retrieved in Step G1, INSTALL a new RH fire suppressor. REFER to Fire Suppressor Removal and Replacement. GO to G4.
If DTC B29A1 or DTC B29A3 was retrieved in Step G1, INSTALL a new LH fire suppressor. REFER to Fire Suppressor Removal and Replacement. GO to G4.
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G4 CHECK FOR ADDITIONAL DTCs
- Refer to the continuous memory DTCs recorded during Step G1.
- Were any continuous memory DTCs retrieved during Step G1?
Yes
REFER to DTC Charts. Diagnostic Trouble Code Tests and Associated Procedures
No
CLEAR the DTCs. REPEAT the self-test.
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G5 CHECK FOR CORRECT FSSM OPERATION
- Disconnect all the FSSM connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the FSSM connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes
INSTALL a new FSSM. REFER to Fire Suppression System Module (FSSM) Service and Repair. REPEAT the self-test.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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